Bug Description

Steps to reproduce:
1. open telephony-app
2. open camera
3. open gallery

Expected results:
app opens without a white page being displayed first

Actual results:
a white page is displayed before the app opens.

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Desired solution :

Every application should provide a loading screen. This screen will be displayed When the app starts-up from a quit state. When the app resumes from suspended state the app screenshot displayed in the Dash should take the focus until the app resumes and is ready to render its screen. When the app is ready a crossfade animation should switch between the screen shot and the resumed render.